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jfrjr(at)roadrunner.com
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 Posted: Fri Apr 04, 2008 6:16 pm Post subject: Scat tube questions |
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I have the plane power 70 amp alternator. The installation manual indicates that a 1" scat tube is needed for cooling---and there is a 1" connection on the back. Where should I get that cooling air?
I also have the Lightspeed ignition for the upper plugs, and that too asks for a scat tube. Since my console is located aft of the firewall on the subpanel do I really need the cooling and, if so, where do I get the cooling air for that item?
Those cooling items brings up another question. We are told that we have to make our baffling as leak proof (see the last RVator where it is recommeded to smooth the upper cowling for less leaking) as possible but then we go and punch these huge holes for the various scat tubes including the massive one for the oil cooler. I mean what does a pinhole leak around the prop governor matter when you are leaking huge amounts thru the various scat cooling holes? What am I missing? Jay Rowe
[img]http://promos.hotbar.com/promos/promodll.dll?GetPromo&El=&SG=&RAND=96781&partner=seekmo&/p.gif[/img]
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ricksked(at)embarqmail.co
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| Posted: Fri Apr 04, 2008 6:53 pm Post subject: Scat tube questions |
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Tap your alternator cooling air off the right inlet air ramp, you make a valid point about sealing a "pinhole" leak. The inlet ramp actually gets it's air prior to the point that provides pressure to the interior upper high pressure portion of cowl, almost like ram air. Most advice regarding sealing the upper portion of the cowl are to make sure cooling air goes where it's meant to go, with 180 kts air being forced into the upper region of the cowl, smooth airflow, through the components with the least amount of turbulence is paramount, your goal and I'm sure I'll get singed in the process is smooth airflow to all the areas...seal all the gaps to make that happen. I have a baffle on my oil cooler to deflect the air back and down to the opening behind the cooler on the bottom cowl... I hope this will aid in continuing the smooth airflow through the cooler and out the bottom aft portion of the cowl.
Rick S.
40185
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jesse(at)saintaviation.co
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| Posted: Sat Apr 05, 2008 6:26 am Post subject: Scat tube questions |
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It's like I say to people who comment on me eating ice cream and drinking Diet Coke at the same time. The ice cream is a given, so I might as well cut back on calories by drinking the Diet Coke instead of regular. In other words, those scat tube holes are given, so don't let more air leak out in unnecessary places than you absolutely can't avoid. Air going to your alternator is not wasted air, but air going out around the prop governor is.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
Cell: 352-427-0285
Fax: 815-377-3694
On Apr 4, 2008, at 9:12 PM, Jay Rowe wrote:[quote]I have the plane power 70 amp alternator. The installation manual indicates that a 1" scat tube is needed for cooling---and there is a 1" connection on the back. Where should I get that cooling air?
I also have the Lightspeed ignition for the upper plugs, and that too asks for a scat tube. Since my console is located aft of the firewall on the subpanel do I really need the cooling and, if so, where do I get the cooling air for that item?
Those cooling items brings up another question. We are told that we have to make our baffling as leak proof (see the last RVator where it is recommeded to smooth the upper cowling for less leaking) as possible but then we go and punch these huge holes for the various scat tubes including the massive one for the oil cooler. I mean what does a pinhole leak around the prop governor matter when you are leaking huge amounts thru the various scat cooling holes? What am I missing? Jay Rowe
[img]http://promos.hotbar.com/promos/promodll.dll?GetPromo&El=&SG=&RAND=96781&partner=seekmo&/p.gif[/img]
[b]
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